On May 1, 1999, China issued the last group of the definitive series: Great Wall, Ming Dynasty. The four stamps included three high valve ones, in which the 50 Yan is the highest value in Chinese definitives ever. The stamps feature four sections of the Great Wall respectively:
            60c   HuanghuaCheng
            10$   HuamaChi
            20$   ShanguanKou
            50$   JiayuGuan